HYDROGEN RECOVERY FROM THE REFORMING GAS USING COMMERCIAL ACTIVATED CARBON MEHDI RAHMANIAN

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1 HYDROGEN RECOVERY FROM THE REFORMING GAS USING COMMERCIAL ACTIVATED CARBON MEHDI RAHMANIAN A dissertation submitted in partial fulfilment of the requirements for the award of the degree of Master of Engineering (Chemical) Faculty of Chemical Engineering Universiti Teknologi Malaysia MAY 2014

2 Specially dedicated to my parents, sister and wife, for their love and support iii

3 iv ACKNOWLEDGEMENT In preparing this dissertation, I was in contact with many people, researchers, academicians, and practitioners. They have contributed towards my understanding and thoughts. In particular, I wish to express my sincere appreciation to my supervisor, Dr. Tuan Amran Tuan Abdullah, for encouragement, guidance, critics and friendship. I am also very thankful to my friend Abdoullatif Gharibi for his guidance, advices and motivation. My sincere appreciation also extends to all my colleagues and others who have provided assistance at various occasions. Their views and tips are useful indeed. Unfortunately, it is not possible to list all of them. I am deeply grateful to all my family members..

4 v ABSTRACT Hydrogen recovery from reforming gas products was investigated using commercial activated carbon in an adsorption column. The commercial activated carbon obtained from market that used for drinking water treatment was applied in this work. In the first part of this study, the effect of treated process of activated carbon by acetic acid, ammonia and steam on hydrogen recovery was studied. In the adsorption study, pressure was increased from atmospheric pressure 1 to 6 bar to investigate the amount of gas adsorbed on fresh activated carbon. In the desorption study, the effects of decreasing pressure was investigated as well. The effect of particle size on the efficiency of hydrogen recovery was emphasis in this study. The results from the experiments indicated that commercial activated carbon was a good candidate for hydrogen recovery because no hydrogen that was adsorbed by activated carbon during our experiments. The recovery of hydrogen was improved to 30.64% and CO 2 was the highest adsorbed compared other gases. The results proved that, a small particle size (171 ) has better performance in comparison to other particle sizes. The activated carbon treated with steam showed the best performance on the hydrogen recovery

5 vi ABSTRAK Pemulihan hidrogen daripada pembaharuan produk gas telah kaji menggunaka karbon teraktif komersial dalam kolum penjerapan. Karbon teraktif komersil diperolehi dari pasaran yang digunakan untuk minum rawatan air telah digunakan dalam kajian ini. Dalam bahagian pertama kajian ini, kesan daripada proses penjanaan semula karbon diaktifkan oleh asid asetik, ammonia dan air pemulihan hidrogen telah dikaji. Dalam kajian penjerapan, tekanan ditingkatkan daripada tekanan atmosfera 1 kepada 6 bar untuk menyiasat jumlah gas yang terserap ke karbon diaktifkan segar. Dalam kajian nyahpenyerapan, kesan mengurangkan tekanan juga disiasat. Kesan saiz zarah terhadap kecekapan pemulihan hidrogen adalah perkara yang ditekankan dalam kajian ini. Keputusan daripada eksperimen kami menunjukkan bahawa karbon teraktif komersial adalah penjerap yang baik untuk pemulihan hidrogen kerana tiada hidrogen yang terserap oleh karbon diaktifkan semasa ujikaji. Pemulihan hidrogen telah meningkat kepada 30.64% dan CO 2 adalah terjerap tertinggi gas lain dibandingkan. Keputusan juga menunjukkan bahawa, saiz zarah kecil (171μm) mempunyai prestasi yang lebih baik berbanding dengan saiz zarah lain. Karbon diaktifkan rawatan yang diterima wap menunjukkan prestasi yang terbaik kepada pemulihan hidrogen.

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